Rob H. McNaught (Siding Spring Survey) has announced the discovery of a new comet on May 10, 2008. The cometary nature of the object was confirmed by A.C. Gilmore and P. Kilmartin (Mount John Observatory, Lake Tekapo) and by N. Teamo (Tiki Observatory, Punaauia). The preliminary orbital elements of the comet C/2008 J3 (McNaught) indicate a perihelion passage on April 3, 2008, at a distance of 3.5 AU from the Sun. Rob McNaught has now 41 comets discoveries to his credit.